Greetings. can you help me ?
I am new here and I exhaust the options to solve my problem. I run in my ethos when starting each card is in its hashrate that I have seen more optimal 28.15 but after a few minutes these fall in half.

what can i do?

before http://i66.tinypic.com/1fimbr.jpg

after http://i67.tinypic.com/2cco0v9.jpg

thanks